#!/bin/bash

# Usage:
#   build-dotnet-bootstrap-tarball <tag-or-commit-from-dotnet>
#
# Creates a source archive suitable for bootstrapping from a tag (or commit) at
# https://github.com/dotnet/dotnet
#
# Clone dotnet/dotnet, check out the tag, and build a source-tarball.
# Can also use a full git commit identifier instead of tag (not an
# abbreviated 8 character commit identifier though).

set -euo pipefail
IFS=$'\n\t'

function print_usage {
    echo "Usage:"
    echo "$0 <tag-from-dotnet>"
    echo
    echo "Creates a $arch bootstrap source archive from a tag at https://github.com/dotnet/dotnet"
}

function clean_dotnet_cache {
    rm -rf ~/.aspnet ~/.dotnet/ ~/.nuget/ ~/.local/share/NuGet ~/.templateengine
    rm -rf /tmp/NuGet /tmp/NuGetScratch /tmp/.NETCore* /tmp/.NETStandard* /tmp/.dotnet /tmp/dotnet.* /tmp/clr-debug-pipe* /tmp/Razor-Server /tmp/CoreFxPipe* /tmp/VBCSCompiler /tmp/.NETFramework*
    rm -rf ~/.npm/
}

function check_bootstrap_environment {
    if rpm -qa | grep dotnet ; then
        echo "error: dotnet is installed. Not a good idea for bootstrapping."
        exit 1
    fi
    if [ -d /usr/lib/dotnet ] || [ -d /usr/lib64/dotnet ] || [ -d /usr/share/dotnet ] ; then
        echo "error: one of /usr/lib/dotnet /usr/lib64/dotnet or /usr/share/dotnet/ exists. Not a good idea for bootstrapping."
        exit 1
    fi
    if command -v dotnet ; then
        echo "error: dotnet is in $PATH. Not a good idea for bootstrapping."
        exit 1
    fi
}

function runtime_id {

    source /etc/os-release
    case "${ID}" in
        # Remove the RHEL minor version
        rhel) rid_version=${VERSION_ID%.*} ;;

        *) rid_version=${VERSION_ID} ;;
    esac

    echo "${ID}.${rid_version}-${arch}"
}

build_bootstrap=false

declare -A archmap
archmap=(
    ["aarch64"]="arm64"
    ["amd64"]="x64"
    ["armv8l"]="arm"
    ["i386"]="x86"
    ["i686"]="x86"
    ["ppc64le"]="ppc64le"
    ["s390x"]="s390x"
    ["x86_64"]="x64"
)

arch=${archmap["$(uname -m)"]}


positional_args=()
while [[ "$#" -gt 0 ]]; do
    arg="${1}"
    case "${arg}" in
        -h|--help)
            print_usage
            exit 0
            ;;
        *)
            positional_args+=("$1")
            shift
            ;;
    esac
done

check_bootstrap_environment

tag=${positional_args[0]:-}
if [[ -z ${tag} ]]; then
    echo "error: missing tag to build"
    exit 1
fi

set -x

dir_name="dotnet-${tag}"
unmodified_tarball_name="${dir_name}-original"
tarball_name="${dir_name}"

unmodified_tarball_name="${unmodified_tarball_name}-${arch}-bootstrap"
tarball_name="${tarball_name}-${arch}-bootstrap"

tarball_suffix=.tar.gz

if [ -f "${tarball_name}${tarball_suffix}" ]; then
    echo "error: ${tarball_name}${tarball_suffix} already exists"
    exit 1
fi


if [ ! -f "${unmodified_tarball_name}.tar.gz" ]; then
    if [[ $tag =~ ^[0-9a-fA-F]+$ ]]; then
        if [ ! -f $tag.zip ]; then
            wget https://github.com/dotnet/dotnet/archive/$tag.zip
        fi
        dir=$(mktemp -d -p $(pwd))
        pushd $dir
        unzip -q ../$tag.zip
        if [[ $(ls -1q | wc -l) -gt 3 ]]; then
            echo "error: tarball doesn't have a single main directory"
            exit 1
        fi
        tar czf ../${unmodified_tarball_name}.tar.gz dotnet-$tag
        popd
    else
        wget https://github.com/dotnet/dotnet/archive/refs/tags/${tag}.tar.gz
        mv "${tag}.tar.gz" "${unmodified_tarball_name}.tar.gz"
    fi
fi

tar tf "${unmodified_tarball_name}".tar.gz > .tarball_file_list
extracted_tarball_root=$(head -1 .tarball_file_list | cut -d/ -f 1)
if [[ "$extracted_tarball_root" == "."* ]]; then
    echo "error: can't find main directory in the dotnet tarball"
    exit 1
fi
if [[ $(grep -cv "^${extracted_tarball_root}/" .tarball_file_list) -gt 0 ]]; then
    echo "error: tarball doesn't have a single main directory"
    exit 1
fi
rm .tarball_file_list

rm -rf "${tarball_name}"
rm -rf "${extracted_tarball_root}"
tar xf "${unmodified_tarball_name}.tar.gz"
mv "${extracted_tarball_root}" "${tarball_name}"

pushd "${tarball_name}"

./prep-source-build.sh --bootstrap

# Remove files with funny licenses and crypto implementations and
# other not-very-useful artifacts. We MUST NOT ship any files that
# have unapproved licenses and unexpected cryptographic
# implementations.
#
# We use rm -r (no -f) to make sure the operation fails if the files
# are not at the expected locations. If the files are not at the
# expected location, we need to find the new location of the files and
# delete them, or verify that upstream has already removed the files.

# rm -r $FILE_TO_REMOVE

popd

echo "Bootstrap .NET SDK: $(jq .tools.dotnet "${tarball_name}"/global.json)"

time tar -czf "${tarball_name}${tarball_suffix}" "${tarball_name}"